They got behind their respective drum kits and went back and forth with beats raising the intensity and complexity with each round. "That was cute," Ferrell said after Smith's impressive showcase. "Do you play for the Lukewarm Chili Peppers?" The actor might not be a professional drummer, but he got Questlove acting as his ghost drummer. He had secret weapons too, a cowbell and the rest of RHCP members singing Blue Oyster Cult's classic "Don't Fear the Reaper".

Before taking the stage for the epic battle, the lookalike duo sat down for a brief chat with Jimmy Fallon. They talked about the history of their dispute, each speaking as the other person. "I can feel the heat coming off of your bodies - the anger, the pent up rage and confusion," the host said to his guests.

"Do you remember where you were when you heard [about this imposter]?" Fallon asked, to which Ferrell replied, "Yeah. I was jamming. I was jammin' with the Chili Peppers, with my guys. At our jamhouse. I'm like, 'Flea, this is bull. I'm tired of not getting enough respect as Chad Smith.' " He added, "I'll be honest, I'm a little high right now," before taking a swig of "Chad Smith Go Juice."

The topic of their resemblance actually came up when Ferrell took part in "Ask Me Anything" chat on Reddit earlier this year, and a fan noted his resemblance to the drummer. "It has been acknowledged many times that myself and Chad Smith, drummer for the Red Hot Chili Peppers, share a resemblance to each other," the actor wrote at the time. "A lot of people think that it's me playing for the Red Hot Chili Peppers. But that would be an insult to Chad Smith. The truth of the matter is there is no Will Ferrell. Only Chad Smith."

In his response, Smith agreed to face off Ferrell in a drum-off for charity. Ferrell was raising money for Cancer for College, while Smith was supporting Little Kids Rock. "I'm all for it. But unless Will's been practicing or is secretly a crazy, wild drummer, I think it'll be evident right off the bat who the real Chad Smith is," the rocker said. "I'm ready to take him down."